Sarjubala, competing for Manipur in the light flyweight (51kg) category, edged past Rebecca via a split decision of 2-1 after an engrossing four-rounder that pushed the gold medal favourite quite hard.
A tempo boxer, who prefers to go all out from the very first round, Sarjubala was matched punch-for-punch by Rebecca but her failure to sustain the intensity gave Sarjubala the victory.
The former junior world championship silver-medallist will next be up against Delhi's Pooja Tokas, who outpunched Tamil Nadu's K Nivedita 3-0.
It was smooth sailing for former junior world champion Nikhat Zareen (51kg) too. She hardly broke a sweat in her contest against Rajasthan's Jyoti and won comprehensively.
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The Telangana girl put up a dominating performance to prevail 3-0 in the contest and set up a clash with Assam's Manju Basumatry.
Also making the last-eight stage was former Asian silver-medallist Pavitra (64kg). She scored a Technical Knockout in the third round of her pre-quarterfinal bout against local favourite Nivedita.
Pavitra will square off against Punjab's Simranjeet Kaur in the quarterfinals tomorrow.
Manipur's Sandhya Rani, who had upstaged two-time World Championships bronze-medallist Chhoto Laura in the opening round yesterday, continued her fine form to enter the quarters.
She defeated Rajasthan's Neha Bhambu via a Technical Knockout in the third round of her pre-quarterfinal contest.
In the later session, Asian Championships silver-medallist Ashish (64kg) also advanced to the round of 16.
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